Grate



July 17, 1928.

I W. A. KNOWLTON GRATE Filed March 9, 1927 2 Shays-Sheet INVENTOR g i b v ATTO R N EY July 17, 1928. 1,677,788

w. A. KNOWLTON GRATE Filed March 9, 1927 2 Sheets-Sheet 2 ATTORN EY Patented July 17, 1928.

UNITED STATES WILLIAMQA. KNOWLTON, or DORCHESTER, MASSACHUSETTS.

'GRATE.

Application filed March 9,1927. Serial No. 174,077.

This invention relates to improvements in grates for furnaces, the, grates being mainly designed for use on the Scotch type of boilers.

The general object of'theinvention is to so form. the grate sections that when they are dumped, ashes and clinkers may be removed from all portions of the fire box'and dumpedinto the ash pit so as to insure a perfectly clean fire and thus increase the efficiency of the furnace.

Another object of the invention is to provide means for securely supporting the grate sections while permitting them to be moved to a dumping position without interference on the part of the supporting means.

This invention also consists in certain other features of construction and in the combination and arrangement of the several parts, to be hereinafter fully described, lllustrated in the accompanying drawings and specifically pointed out in the appended claims.

In describing my invention in detail, reference will be had to the accompanying drawings wherein like characters denote like or corresponding parts throughout the several views, and in which Figure 1 is a front view with portion of a boiler provided with three furnaces, each of which is equipped with the improved grate.

Figure 2 is a section on line 22 of Figure 1. v

Figure 3 is a section on line 33 of Figure 2.

Figure 4 is a section on line 44 of Figure 3.

Figure 5 is a section on line 55 of Figure 3.

Figure 6 is a section on line 66 of Fig: ure 3. g

In these views, 1 indicates a portion of a Scotch type of boiler and 2 indicates the horizontally arranged cylindrical furnaces for heating the water in the boiler. Figure 1 shows three of these furnaces. As is wellknown, the cylinder forming this type of furnace is corrugated, as shown at 3, and the grade A- extends horizontally across the cylinder and divides the same into an upper and lower chamber, the upper chamber being the fire box and the lower one the ash pit. The grate A is composed of the side Sections 7 and the intermediate sections 8, the drawings showing two of these intermediate sections. Each section has a pintle 9 receiving the pintles.

at each end thereof, and these pintles are supported by the front andrear cross bars 10 which are provided with recesses 11 for The grate sections are also supported by a centrally arranged cross bar 12 so that the grate is firmly supported by the three cross bars,"one of which is arranged at the center of the grate. The front pintles are provided with the extensions 13 for receiving a crank handle by which the sections can be shaken or dumped.

Each section has its upper and lower faces fiat and each section is provided with a plurality of elongated openings 14 therein and the side sections are each formed with a wing 15 at its outer edge which is of corrugated shape to conform to the corrugations of the cylinder 3 so that the side sections will make aclose fit with the sides of the furnace. Each wing may be provided 7 with the holes 16 for permitting ashes to drop through at these points. I

In order to enable the sections to be moved to dumping position without interference on the part of the middle cross bar, I form each section with an opening 17 in one edge of its central portion, this opening receiving the central cross bar as the section is moved to dumping position, as clearly shown in Figure 5. In order to provide means for filling this opening or hole when the grate section is in horizontal position, I provide a raised portion 18 on the central cross bar which will fill the major portion of each opening with the top of the raised part flush with the top of the grate section.

Fromthe foregoing it will be seen that the grate fits closely the walls of the fire box of the furnace so that the fuel can be Spread over the entire width and length of the fire box. It will also be seen that when the grate is dumped, the sections will permit the ashes and clinkers to drop into the ash pit and there will be no ledges or projections which will hold the ashes so that a clean fire can he kept in the furnace with little labor and the efiiciency of the furnace will be increased.

It is thought from the foregoing description that the advantages and novel features What I claim is '1. In combination with a furnace, front and rear cross bars in the furnace, a central cross bar therein, a plurality of grate sections, pintles at the ends of the sections rotatably supported by the front and rear cross bars, each section having flat upper and lower faces and each section. being of considerable width, each section having a central opening extending through the top and bottom of the section and from one edge to the axis of the pintles to permit the section to be rocked without interference on the part of the central supporting bar.

2. In combination with a furnace front and rear cross bars in the furnace, a central cross bar therein, a plurality of grate sections, pintles at the ends of the sections rotatably supported by the front and rear cross bars, each section having flat upper and lower faces and each section being of considerable wiclth, each section having a central opening extending through the top and bottom of the section and fromone edge to the axis of the pintles to permit the section to be rocked without interference on the part of the central supporting bar, said central supporting bar having raised portions thereon which extend into the openings when the sections are in flat position.

In testimony whereof I'afiiX my signature.

WILLIAM A. KNOWLTON 

